key...not sure what this means

I was wondering if someone out there can help me. I am not sure what this means,
"KeyCorp (KEY.N), a Cleveland-based lender found to have a $1.8 billion shortfall, on Wednesday announced plans to exchange common shares for up to $1.74 billion of trust preferred securities. It previously said it would sell $750 million of common stock in an at-the-market offering."